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Research and Performance Evaluation of an Autogenic Acidic Fracturing Fluid System for High-Temperature Carbonate Reservoirs

  • INNOVATIVE TECHNOLOGIES OF OIL AND GAS
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Chemistry and Technology of Fuels and Oils Aims and scope

Carbonate reservoirs in Western China are characterized by deep burial, high temperature, and strong heterogeneity. In this paper, based on the physical properties of high-temperature carbonate reservoirs, the authors have developed an autogenic acidic fracturing fluid suitable for high-temperature carbonate reservoirs. The performance of the new acidic fluid has been experimentally evaluated. The results show that the fluid demonstrates satisfactory viscosity-temperature performance, and after continuous shear tests at 140°C for 2 h the viscosity of the fluid remains about 100 mPa∙s. At room temperature (RT), the pH value of the fluid is neutral, and the titratable acid concentration could reach 15.49% at 90°C. When subjected to high temperatures, the fluid is characterized by a high acid concentration, low acid generation rate, and moderate corrosion inhibition rate. The static rock corrosion rates of the fluid at room temperature and 140°C are 0.00009125 and 0.009575 g/min, respectively. The corrosion rate is slow, and the effective action distance of the fluid can be five times higher than that of a thickened acid and three times higher than that of a cross-linked acid. The experimental results verify the acid’s ability to transform high-temperature carbonate reservoirs and good applicability in high-temperature carbonate reservoirs. The proposed autogenic acidic fracturing fluid system provides essential technical support for the efficient development of high-temperature carbonate reservoirs.

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Authors and Affiliations

  1. Exploration Department of Changqing Oilfield Company, Changqing, China

    Jingchao Lei & Jianpeng Jia

  2. Equipment Service Department of Bureau of Geophysical Prospecting INC., China National Petroleum Corporation, Zhuozhou, China

    Baoning Liu

  3. Loggin Company of CNPC Greatwall Drilling Co., Beijing, China

    Wei Yan

Authors
  1. Jingchao Lei
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  2. Jianpeng Jia
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  3. Baoning Liu
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  4. Wei Yan
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Correspondence to Jingchao Lei.

Additional information

Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 5, pp. 92–97, September-October, 2021.

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Lei, J., Jia, J., Liu, B. et al. Research and Performance Evaluation of an Autogenic Acidic Fracturing Fluid System for High-Temperature Carbonate Reservoirs. Chem Technol Fuels Oils 57, 854–864 (2021). https://doi.org/10.1007/s10553-021-01316-w

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  • DOI: https://doi.org/10.1007/s10553-021-01316-w

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